Carbureter for internal-combustion engines.



J. T. JENNINGS.

CARBURETER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JULY 24. I917.

Patented Apr. 8,1919.

A ENT 0 rice.

CARBURETER FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Apr. 8, 1919.

Application filed July 24, 1917. Serial No. 182,561.

To all whom it may concern:

Be it known that I, JOHN THOMAS JEN- nines, subject of the King of Great Britain, residing at 35 Wharf road, Kings Norton, Birmingham, in. the county of Warwick, England, have invented a new and useful Carbureter for Internal-Combustion Engines; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invention comprises improvements in the control mechanism employed in carbureter float chambers 2'. e., the mechanism whereby the valve is actuated by the float.

Hitherto carburetors of the float feed type have had the needle valve operated by the float through a pair of levers fitted either above or below the float, or the needle has been lifted directly by the float. These forms of construction, while they efliciently and positively actuate the needle valve when the float is moved in the one direction, yet there being no positive control in the reverse direction the valve isliable to stick or move erratically, and when balance weights are fitted, as with a downward closing needle valve and overhead levers, they frequently have a damaging effect on the float, the needle valve and its seating. This effect will also be produced to some extent by any arrangement in which the float rigidly operates the needle valve.

The object of the present invention is to overcome these defects in a simple and convenient manner and in accordance therewith the float is provided with a sufficient elastic lever mechanism whereby it positively actuates the valve when it moves in either direction and whereby the whole weight of the float can be made available for lifting the needle valve.

To this end lever controlling mechanism is fitted above and below the float'so that the valve is positively actuatedboth when the float rises and when it falls.

Referring to the drawings Figure 1. is a vertical sectional view taken through a float chamber according to this invention.

Fig. 2. is a plan of same with the cover removed.

Fig. 3. is an underside perspective view of the cover.

Fig. 4. is a plan view of one of the collars ings, two levers or rockers 1, l are pivoted on.

a ring projection 2 of V section or other suitable shape formed on the bottom 3 of the float chamber l and two other similar levers on a similar V projection 5 on the inside of the lid 6 of the float chamber, the levers preferably being shaped so as to lock themselves in the right position relatively to the needle valve and to one another when in position.

Although the above construction is preferred the main object of the invention may be accomplished by the employment of levers mounted on pivot pins instead of employing the V section or other shaped pivots.

The levers 1, 1 are preferably made of hard sheet brass of a suitable thickness and are thus sufliciently elastic not to transmit the shocks referred to from the float to the needle or vice versa such as are caused by engine vibration or road shocks, thus preventing damage to the float and needle. The levers are shaped to rock upon the V pivots while their extremities have a sliding engagement with the surface of the float.

Further advantages are that the float 7 can be made of stouter construction than is possible with abutting levers acting only above it, as its weight is partly balanced by the needle valve 8; and for the same reason the vertical displacement of the float can be less than in the ordinary constructions referred to. From this results a lesser difference in the height of the fuel in the float chamber and jet when fuels of varying specific gravity are used. Though the 'arrangement sometimes adopted of abutting levers acting only below the float has these advantages, it is subject to the great disadvantage that the needle is liable to be lifted off its seating to an excessive extent by road or engine vibration thereby causing flooding at the jet and waste of fuel.

As shown the needle valve is fitted with a pair of collars as 9, 9*, one above and the wise secured to the valve. The upper collar has slots or notches 10 in which are engaged the downwardly depending extremities 11 of the levers. Preferably the upper collar 9 is loose and merely rests upon the fixed collar 13 which is small enough to pass through the middle of the float, enabling all the parts to be readily disconnected. The lower collar 9 is a simple disk without notches and fits between the forked ends of the levers so as to retain the levers in the central position. The inner ends of the levers are adjacent to one another so as to restrict angular movements of the levers in the plane of the annular fulcrum which serves to keep them in this position. In the case of the top collar and levers, this collar is made larger than the bottom collar need be and, as previously stated, has slots or notches to receive the extremities of the bent ends of the levers, which keeps them in position while the cover or lid of the float chamber is not in engagement with them. The bottom collar can be similarly slotted if desired.

As illustrated the cover is secured upon the float chamber by means of a spring ring 12.

What I claim then is 1. In a float chamber for a carbureter the combination'of a casing; a valve; a float; and pivoted levers disposed above and below the float and connected to the valve; for the purpose specified.

2. In a float chamber for a carbureter the combination of a casing; a valve; a float; and levers pressed from sheet-metal and disposed above and below the float, so arranged disposed above and below the float and bent to provide a rocking connection with said annular projections and serving to connect ghe float to the valve; for the purpose speci- 4. In a float chamber for a carbureter the combination of a casing; a float; a valve passing concentrically through the float and having collars thereon; and pivoted levers disposed above and below the float and having extremities bent to interlock with said collars on the valve; for the purpose specified.

5. In a float chamber for a carbureter the combination of a casing having an annular internal projection upon its base; a cover having a similar internal projection upon its underside; a float; a valve passing concentrically through the float and having collars thereon; and levers disposed above and below the float and bent to provide a rocking connection with said annular projections and serving to connect the float to the valve, said levers having extremities bent to inter lock with said collars on the valve, for the purpose specified.

In testimony whereof I aflix my signature.

' 1 JOHN THOMAS JENNINGS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

